using System;

namespace org.apache.lucene.store
{

    /*
     * Licensed to the Apache Software Foundation (ASF) under one or more
     * contributor license agreements.  See the NOTICE file distributed with
     * this work for additional information regarding copyright ownership.
     * The ASF licenses this file to You under the Apache License, Version 2.0
     * (the "License"); you may not use this file except in compliance with
     * the License.  You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    ignore

    /// <summary>
    /// Provides JNI access to native methods such as madvise() for
    /// <seealso cref="NativeUnixDirectory"/>
    /// </summary>
    public final class NativePosixUtil
    {
      public final static int NORMAL = 0;
      public final static int SEQUENTIAL = 1;
      public final static int RANDOM = 2;
      public final static int WILLNEED = 3;
      public final static int DONTNEED = 4;
      public final static int NOREUSE = 5;

//JAVA TO C# CONVERTER NOTE: This static initializer block is converted to a static constructor, but there is no current class:
      static ImpliedClass()
      {
//JAVA TO C# CONVERTER TODO TASK: The library is specified in the 'DllImport' attribute for .NET:
//      System.loadLibrary("NativePosixUtil");
      }

      private static native int posix_fadvise(FileDescriptor fd, long offset, long len, int advise) throws IOException;
      public static native int posix_madvise(ByteBuffer buf, int advise) throws IOException;
      public static native int madvise(ByteBuffer buf, int advise) throws IOException;
      public static native FileDescriptor open_direct(string filename, bool read) throws IOException;
      public static native long pread(FileDescriptor fd, long pos, ByteBuffer byteBuf) throws IOException;

      public static void advise(FileDescriptor fd, long offset, long len, int advise) throws IOException
      {
//JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
//ORIGINAL LINE: final int code = posix_fadvise(fd, offset, len, advise);
        int code = posix_fadvise(fd, offset, len, advise);
        if (code != 0)
        {
          throw new Exception("posix_fadvise failed code=" + code);
        }
      }
    }


}
